Manuel Ignacio López Quintero
Install OpenCV on Ubuntu or Debian

Install OpenCV on Ubuntu or Debian is a bit long but very easy. You can install OpenCV from the Ubuntu or Debian repository or from the official site.

OPTION 1: INSTALL OPENCV FROM THE UBUNTU OR DEBIAN REPOSITORY

You can install OpenCV from the Ubuntu or Debian repository:

sudo apt-get install libopencv-dev python3-opencv

However, you will probably not have installed the latest version of OpenCV and you may miss some features.

OPTION 2: INSTALL OPENCV FROM THE OFFICIAL SITE

To install the latest version of OpenCV be sure that you have removed the library from the repository with sudo apt-get autoremove libopencv-dev python-opencv and follow the steps below.

2.1. RUN AN INSTALLATION SCRIPT

The most simple and elegant way to install a library is running an installation script.

Download the installation script install-opencv.sh, open your terminal and execute:

bash install-opencv.sh

Type your sudo password and you will have installed OpenCV. This operation may take a long time due to the packages to be installed and the compilation process.

2.2. EXECUTE SOME OPENCV EXAMPLES

Go to your OpenCV directory and execute a C++ example:

cd build/bin
./example_cpp_edge ../../samples/data/fruits.jpg

Now, go to your OpenCV directory and execute a Python example:

cd samples/python
python3 video.py

Finally, go to your OpenCV directory and execute a Java example:

cd samples/java/ant
ant -DocvJarDir=../../../build/bin -DocvLibDir=../../../build/lib

2.3. COMPILE A DEMONSTRATION

Download the files demo.cpp and CMakeLists.txt and put them into a folder. Now, open your terminal, go to the folder and execute:

mkdir build && cd build && cmake .. && make

Finally, run the demo: ./demo.

And that's it! You have installed OpenCV, run some examples, and compiled OpenCV code!

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